Headstone and Source

Headstone noun - A shaped stone laid over or erected near a grave and usually bearing an inscription to identify and preserve the memory of the deceased.

Source and headstone are semantically related. In some cases you can use "Source" instead a noun "Headstone".

Source noun - A point or place at which something is invented or provided.

Headstone and source are semantically related. Sometimes you can use "Headstone" instead a noun "Source".